Muffle-leer construction



,.D. L. GEER.

MUFFLE LEER CONSTRUCUON'.

APPLICATION FILED NOV. Z5, 1919.

RENEWED OCT. 7. 1.920.

L 2. 92 1T. cum 2A VUB .ma JH 1aau2 M na D..

UNITED STATES PATENT OFFICE.

PAUL L. GEER, OF BELLEVUE BOROUGH, PENNSYLVANIA, ASSIGNOR T0 -AMSLER-MORTON COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

MUFFLE-LEER CONSTRUCTION.

Specification of Letters Patent.

Patented July 26, 1921.

Application led November 25, 1919, Serial No. 340,468. Renewed October7, 1920. Serial No;V 415,376.

T 0 all whom z't may concern:

Be it known that l, PAUL L. GEER, a citizen of the United States, andresiding in the borough of Bellevue in the county of Allegheny and Stateof Pennsylvania, have invented or discovered new and useful Improvementsin Mufle-Leer Construction, of which the following is a specication.

My invention consists of new and useful improvements in muflieleers.

The objects which I have in view are, inter ala; as follows:

To provide a leer in which the gaseous products of combusti-on arebrought into such intimate contact withl the walls of the Inutile thatthe maximum heating effect is obtained.

To provide they proper temperature gradienti from the front to the rearof t-he leer.

To provide a gas tightmule of improved construction which will allow forthe necessary expansion and contraction without leak-' age or rupture.

To provide an inexpensive, yet efficient, durable and easily repairedmuile. leer.

For these and other objects, l have invented a inutile leer in which thecombustion of the gaseous fuel takes place under the forward end of themuftle, the products of combustion being led upwardly through verticalflues at the sides of the mulie to the crown, and' thence downwardlythrough reverse lues toa chamber in the rear of and separated from thecombustion chamber. Thence the products are led up through iiues at thesides of the muille to the rear portion of the crown which, is separatedfrom the forward portion of the crown by a baiie or intersecting wall,and thence `said products pass along the crown extension to the -stackin the rear of which is the tunnelwhich extends to the discharge door ofthe leer. The third or rear series of vertical fiues are preferably ofless capacity or fewer in number than the irst and second named seriesto prevent too rapid passage of the products of combustion. The travelof the products of combustion is further regulated -by the stack damper,while the intensity of the heat in the combustion chamber is regulatedby the air and gas valves of fthe,

burner, where a gas burner is used.

rlhe outer. walls and roof of the leer may' be of the usual fire brickconstruction, but

I provide for the structure of the inutile, the

flues and the crown extension special inter-` locking tiles whose jointsare rendered gastight by means of plastic cement.

In theA rear of the mutiie the side walls of the leer are contractedinwardly into alinementwith the walls of the mui'le, and the alined withthe walls and roof of the inutile.

In the accompanying drawings. which are merely intended'to illustratethe principles of my invention without limiting the scope of the saineto the construction shown, Figure 1 is a central longitudinal section ofthe Inutile portion of a leer embodying my present improvementstakenalong the line I-'I in Fig. 2; Fig. 2 is a section of the sametaken along the line II-.II in Fig. l; Fig. 3 is a horizontal sectiontaken along the irregular line IIL-III in Fig. 2; Fig. 4 is a brokencentral longitudinal section of Athe complete leer: Fie. 5 is a section'taken along the line V`7 in Fig. 4. showing the crownextensionconstruction: Fig. 6 is a similar view taken along the line lll-YI inFig. 4, showing the tunnel construction; Fig. 7 is an enlarged sectiontaken along the line VII-VII in Fig. 2 showing the Inutile arch or roofconstruction; Fig. 8 is an enlarged perspective of one of the Inutilewall tiles. and Fig. 9 isa similar view` of one of the muie floortiles.A

The following is a detailed description of the embodiment of myinventionl shown in the drawings.

The outer structure of the leer is prefer- .ably constructed of theusual fire brick sup- The gas burner E extends through the front wall ofthe combustion chamber and 1s provided with a gas valve 7 and an airvalve 8.

The mufHe D is supported by the wing walls 9 extending inwardly from theside walls 2 of the leer and vertical piers 10.

The side walls of the muffle D are formed by vertically disposed walltiles 11 having inner and preferably paneled faces 12 and rearwardlyextending vertical edge flanges 13 which when the tiles 11 are assembledon r the wing walls 9. as shown in the drawings.

to forni the walls of the mufiie'. extendoutwardly into contact with thewalls 2 of the leer. rl`he tiles 11 span the spaces between thewingwalls 9. and thus the flanges 13 form lwith said wing walls verticalflues 14 in the sides of the muiile. The floor of the mulfle is composedof floor tiles 15, tongued and `grooved at their edges to interlock',the edges of the outside tiles' interlocking with an undercut portion ofthe tiles 11. as 'shown edges are provlded with depending lips or anges19 which fit into the flanges 1 8, and

so support the roof tiles in place.

The joints between the tiles are filled with a plastic cement 20 to makean expansble but gas-tight union. For this purpose. I prefer to use amixture of 25% of silicate of soda and T57( of low grade fire clay. thusobtaining a cement whichfuses at about 1600 Fahr.

The front of the leer and of the nmtlie is closed by the' front wall 21through which the burner E extends into .the ycombustion chamber 4. Adoor or doors 22 closes the front of mutiie D, while 23 is a peep orcleaning hole leading into the front end of the crown flue andnormallyclosed with a suitable closure. y

2-1 is a vertical'baiie intersecting the crown flue at a point abovethechamber At the rear of the Inutile Dpthe walls 2 of the leer contractinto line with the side walls of the mutfle and are provided withinwardly projecting abutment tile having inclined tongued and groovedfaces which support the roof arches for the crown extension. In the rearof the crown'extension B the roof of the leer is lowered to form thetunnel C whose side walls and roof are substantially alined with theside walls and roof of the niuifle. The stack F is mounted on the leerat the rear end of the crown extension.

It is evidentthat the firsty series of vertical flues 11, in front oft-he back wall 6, are up flues; that the next series of flues 14 infront of the baffle 21 are down flues. and the flues 14 in the rear ofthe baffle 2-1 are up flues.

Thus the products of combustion travel upwardly from the combustionchamber around the mufl'le. thence back along the crown flue and thencedown around the mutiie into the chamber 5 and thence up around themuflle to the crown flue and thence rearwardly along the extension ofthe crown to the stack.

It is thus evident that the entire length of the muffle is completelyenveloped by the products of combustion, the heat gradually lesseningfrom the front to the rear, and the intensity of the heat and the travelof the products of combustion being adjustable `with nicety by means ofthe burner valves and stack damper.

My leer is much simpler, and less expensive in construction than thetypes of inutile leer now in use. My leer is not damaged by expansionand contraction due to temperature changes, nor will such changes resultin the entrance of sulfur or other injuriousfumes into the interior ofthe inutile. The tile construction is so designed as to be of remarkablestrength and durability. and quick and easy repairs are made by thesubstitutionof new tiles when necessary.

Although, `for the sake of clearness of illustration of the principlesof my invention, 1- have` minutely described the embodiment of the sameshown in the accompanying drawings, I do not wish to limit myselfthereby, but claim lbrpadly 1. A mutiie leer comprising an outerfurnacestructure. an elevated mufHe mounted therein` alongitudinal/crownflueabove the Inutile. a combustion chamber under the forward portion ofthe Inutile. a reverberatory chamber under the rear portion of themuffie. a vertical wall separating said chambers. a baile wallintersecting the crown flue above the reverberatory chamber, a series ofvertical flues on either side of the muiiie connectf ing the combustionchamber with the crown flue; a second series of vertical flues at eitherside of the muiiie, and in rear of said fi'rst named flues, connectingthe crown flue in front of the baiiie wall with the reverberatorychamber. a third series of vertical flues. in the rear of said secondnamed flues. connecting the reverberatory chamberwith the crown flue inthe rear of the baffle wall7 and means for leading off the products ofcombustion from the rear end of the lcrown flue. whereby the products ofcombustion ascend from said combustion chamber about iso saidmutlle tothe crown Hue, thence descend from said crown Hue about said' muHle tosaid reverberatory chamber, and thence ascend from said reverberatorychamber about said Inutile to the crown Hue in the rear of said baillewall.

2. A inutile leer comprising an outer furnace structure, an elevatedmuHle mounted therein, a longitudinal crown Hue above the mullle, acombustion chamber under the forward portion of the muille, areverberatory chamber under the rear portion of the muille, a verticalwall separating said chambers, a baille wall intersecting the crown Hueabove the reverberatory chamber, a series of vertical Hues on eitherside of the muHle connecting the combustion chamber with the crown Hue;a second series ofv vertical Hues at either side of the muHle, and inrear of said Hrst named Hues, connecting the crown Hue in front of thebaille wall with the'reverberatory chamber, a third series of verticalHues, in the rear of said second named Hues, connecting thereverberatorv chamber with the crown Hue in the rear of the baille wall,

said third named Hues having a combined capacity less than that of thesecond named Hues, and means for leading off the products of combustionfrom the rear end of the crown Hue, whereby the products of combustionascend from said combustion chamber about said muille to the crown Hue,thence descend from said crown Hue about said muHle to saidreverberatory chamber, and thence ascend from said reverberatorychamberl about said muille to the crown Hue in the rear of said baillewall.

3. A muHle leer comprising an outer furnace structure, an elevated muHemounted therein, a longitudinal crown Hue above the Inutile', the sidewalls of the outer furnace being contracted in the rear of the muilleinto alinement with the side walls of the latter to form a tunnel andthe crown Hue being extended beyond the rear end of the muHle, acombustion chamber under the forward portion of the muffle, areverberatory chamber under the rear portion of the muf- He, a verticalwall separating said chambers, a baffle wall intersecting the crown Hueabove the reverberatory chamber, a series of vertical Hues on eitherlside of the muHle connecting the combustion /cham'ber with the crownHue; a second series of vertical Hues on either side 4of said Inutile,and

"in the rear of said Hrst named Hues, connecting the crown Hue with thereverberatory chamber, and a third series of vertical Hues.

on either side of said muille, and in the rear of said second namedHues, connecting the reverberatory chamber with the crown Hue in therear of the baille wall, whereby the products of combustion ascend fromthe combustion chamber to the crown Hue, thence descend from the crownHue to the reverberatory chamber, and thence ascend from thereverberatory chamber to the crown Hue in the rear of said baille toescape to atmosphere.

4. A inutile leer comprising an outer furnace structure, an elevatedmuflle mounted therein, a longitudinal crown Hue above the muille, theside walls of the outer furnace being contracted in the rear of themuille into alinement with the side walls of the latter to form a tunneland the crown Hue being extended beyond the rear end of lthe mu e, acombustion chamber under the forward portion of the muiHe, areverberatory chamber under the rear portion of the muH'le, a verticalwall separating said chambers, a baille wall intersecting the crown Hueabove the reverberatory chamber, a series of vertical Hues on eitherside of the mufile connecting the combustion chamber with the crown Hue,a second series of vertical Hues on either side of said muHle, and inthe Vrear of said first named Hues, connecting the crown Hue with thereverberatory chamber, and a third series of vertical Hues on eitherside of said mulle, and in the rear of said second named Hues,connecting the reverberatory chamberY with the crown Hue in the rearofthe baille wall, said last named Hues having a combined capacity lessthan that of the second namedHues, whereby theproducts of combustionascend from the combustion chamber to the crown Hue, thence descend fromthe crown Hue to the reverberatory chamber, and thence ascend from fthereverberatory chamber to the crown Hue in the rear of said baille toescape to atmos-` phere. y,

5. A mulle leer comprising an outer furnace structure, an elevatedmutlle mounted therein, a longitudinal crown Hue above the `muHle, theside wall of the outer furnace being contracted in the rear of themuille into alinement with the sidey walls of the latter to form atunnel and the crown Hue beingextended beyond the rear end of said mutHeand for a portion of the length of said tunnel, a combustion chamber1under the forward portion of the mulle, a reverberatory chamber underthe rear of said muHle, a vertical wa'll separating said chambers, abaille wall intersecting the crown Hue above said reverberatory chamber,a series of vertical Hues of either side of the muHle connecting thecombustion chamber with the crown Hue, a second series of Hues, in therear of said first named Hues, connecting the crown Hue with thereverberatory chamber, a third series of Hues, in the rear of saidsecond named Hues, connecting the reverberatory chamber with the crownHue in the rear of the baHle wall, and a stack connected to i the rearend `of said crown Hue, whereby the products of combustion ascend fromthe combustion chamber to the crown flue, thence descend from the crownflue to the reverberatory chamber, and thence ascend from thereverberatory chamber to the crown flue in the rear of said baffle wallto escape through said stack.

6. A muffle leer comprising an outer furnace structure, an elevatedmuffle mounted therein, a longituidnal crown flue above the mufile, theside wall of the outer furnace being contracted in the rear of themuflie into alinement with the sidewalls of the Vlatter to 1form atunnel and the crown flue being extended beyond the rear end of saidmuffle and for a portion of the length of said Itunnel, a combustionchamber under the forward portion of the muffle, a reverberatory chamberunder the rear end of said muffle, a vertical wall separating saidchambers, a baffie wall intersecting the crown flue above saidreverberatory chamber, a series of vertical fiues on either side of themufiie connecting the combustion4 chamber with the crown flue, a secon-dseries of fiues, in the rearL of said first named flues, connectingr thecrown flues with the reverberatory chamber, a third series of flues, inthe rear of said second named flues, connecting the reverberatorychamber with the crown flue in the rear of the baffle wall, said lastnamed flues having a less combined capacity than that of the secondnamed fiues, and a stack connected to the rear end yof said crown flue,whereby the products of combustion ascend from the combustion chamber tothe crown flue, thence descend from the crown flue to the reverberatorychamber, and thence ascend from the re- Verberatory chamber to the crownflue in the rear of said baffle wall to escape through said rta-ck.

`7. In a mufi'le leer construction, 'side wall tile for the muifiehaving front faces which fit together to lform the muflie wall surfaceand rearwardly extending vertical edge composed of spaced apart archesprovided.

with laterally extending trough fianges and Vthe intervening spacesbeingfilled to comi plete the roof with roof tile having inwardly extendingflanges along their opposed edges which flanges are seated in the troughfianges of the roof arches.

10. In a muffle leer,'a muffle roof struct-ure composed of spaced apartarches provided with laterally extending trough flanges, and theintervening spaces being filled to complete the roof with roof tilehaving inwardly extending flanges along their opposed edges whichflanges are seated in the trough flanges of the roof arches, the troughflanges of the roof arches being provided with al filling of plasticmaterial to form a gas-tight joint.

11. In a muffie leer, a muiiie roof structure composed ofspacedapartarches provided with laterally lextending trough flanges, andthe intervening spaces being filled to complete the roof with roof tilehaving inwardly' extending flanges along their opposed edges whichflanges are seated in the i trough flanges of the roof arches, theabutting edges of said roof tile being provided with tongue and grooveconnection.

12. In a muffle leer, a muli'le roof structure composed of spaced apartarches provided with laterally extending trough flanges, and theintervening spaces being filled to complete the roof with roof tilehaving inwardly extending flanges along their opposed edges whichflanges are seated in the trough flanges of the roof arches, theabutting edges of said roof tile being provided with tongue and grooveconnection, and the joints of said structure being packed with plasticcement to render the same gas-tight.

13. A side wall tile for `leer mufiles provided with a plane face andtwo rearwardly extending vertical edge flanges, substantially as and forthe purpose set forth.

14. A side wall tile for leer muffles provided with a plane face and tworearwardly extending vertical edge flanges, the edges of said tile beingtongued and grooved for in- -terlocking with each other, substantiallyas and for the purpose set forth.

15. A roof arch tile for leer muffles having laterally extending troughflanges to supportv the roof` tile, the arch tile being longitudinallycurved vsubstantially as and for the purpose set forth.

16. A roof arch tile for leer muffies having laterally extending troughflanges to support the roof tile, the arch tile beinglongitudinallycurved and their ends being tongued .and grooved tointerlock with each other,

substantially as and for the purpose set i forth.

17. A roof tile for leer muflies curved to fit the arch and having edgeflanges to engage the roof arches, substantially as and for the purposeset forth.

18. A roof tile for leer muffies curved to fit the arch and having edgefianges to engagethe roof arches, the abutting ends of the roof ltilebeing tongued and grooved to interlock together., 'substantially as andfor the purpose set forth.

` 19. .A floor structure .for the muie of a Inutile leer comprising WingWalls extending piers between the ends of opposed Wing 10 inwardly fromthe side Walls of the leer, Walls, and flat floor tile'supported on saidpiers between the ends of opposed Wing Wing Walls and piers, theabutting edges of Walls, and flat Hoor tile supported on said said floortile being tongued and grooved to Wing Walls and piers, substantially asand interlock together, substantially as and for for the purpose setforth. the purpose set forth. V 15 20. A floor structure for the muffleof a Signed at Pittsburgh, Pa., this 24th day muHe leer comprising WingWalls extending of November, 1919.

inwardly from the side Walls of the leer, PAUL L. GEER.

